https://bugs.llvm.org/show_bug.cgi?id=43764

            Bug ID: 43764
           Summary: Unqualified name use causes ambiguity through ADL
                    (forward_as_tuple)
           Product: libc++
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected], [email protected]

I have a library that redefines forward_as_tuple in its namespace, along with
some concrete types. This causes the problem with the following code:

https://github.com/llvm/llvm-project/blob/master/libcxx/include/tuple#L1352
https://github.com/llvm/llvm-project/blob/master/libcxx/include/tuple#L1367

Here, forward_as_tuple is being called unqualified, and ADL kicks in. ADL finds
the definition of forward_as_tuple in the library that I am using, and I get
ambiguity.

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